— How long are you staying there?—.A. Next weekB. On SundayC. Next monthD. For a month

问题补充：

— How long are you staying there?—.

A. Next week

B. On Sunday

C. Next month

D. For a month

答案：

A. Next week

B. On Sunday

C. Next month

(答案→)D. For a month

解析：本题问的是时间长度，一个月表示的是时间的长度，故本题选D。